added destructor to requester for global cleanup

requester.cpp

@@ -30,6 +30,10 @@ requester::requester() {
     curl_easy_setopt(_h.get(), CURLOPT_WRITEFUNCTION, write_data);
 }
 
+requester::~requester() {
+    curl_global_cleanup();
+}
+
 std::string requester::get(const std::string &url) {
     curl_easy_setopt(_h.get(), CURLOPT_URL, url.c_str());
     std::vector<char> buf;

requester.hpp

@@ -20,6 +20,7 @@ class requester {
 
         // this class is a RAII class for a curl handle
         requester();
+        ~requester();
 
         // perform a http get request
         std::string get(const std::string& url);